a Pseudowire like solution, to get a public IP range routed to that Interface.
( with BGP support on that interface )
some dial in tunnel without encryption.
Can you please provide a bit more information about what specifically this is needed for (i.e., an ISP prefers this type of connection, or it's required for interoperability with X, Y or Z.)
A feature request with information like "This technology is required to interface with product from BIG TELCO" or "This would help reduce equipment costs as we would not need to implement is more compelling to the team that prioritizes these requests than just a request for it.
WatchGuard Customer Support
this feature is needed for routing provider independent address space over any internet connection.
to have HighAvailablity for your PI IP range.
You are aware that we (as a planet) are pretty much out of IPV4 and it would be easier to accomplish with V6? I do not play with RIPE often, but, I am pretty sure that with 4 you are SOL.
I've created a new feature request for this for you -- it's FBX-23741. Please create a support case and mention FBX-23741 if you'd like to follow it or receive updates related to it.